I play at work, between phone calls, while on hold, and generally whenever I've got a free minute. Yesterday in particular things got away, and while I'd saved my puzzle, and signed out, when I logged on today, there's a puzzle showing to have taken me 48,968 seconds to complete

Sudoku puzzles solve the cheating problem by blanking the screen on pause so you can't use pause to think or solve. It is frustrating to be interrupted with a phone call in the middle of a puzzle and not be able to stop the clock.